WO2013170771A1

WO2013170771A1 - Set-top box control method, set-top box and system thereof

Info

Publication number: WO2013170771A1
Application number: PCT/CN2013/075740
Authority: WO
Inventors: 苏永彬; 林延福; 秦小庆
Original assignee: 华为终端有限公司
Priority date: 2012-05-18
Filing date: 2013-05-16
Publication date: 2013-11-21
Also published as: CN103428557B; CN103428557A

Abstract

Embodiments of the present invention relate to the field of communications, provide a set-top box and a control method thereof, and can provide a set-top box for transmitting different radio frequency input signals to multiple television devices at the same time. A set-top box control method comprises: receiving at least two radio frequency input signals; correspondingly modulating each radio frequency input signal to a fixed frequency point; correspondingly matching an output port for each fixed frequency point; and correspondingly sending, through the output port, the radio frequency input signal on the matching fixed frequency point. The embodiments of the present invention are applicable to a set-top box to control a television device.

Description

The invention relates to a control method for a set top box, a set top box and a system thereof. The application is submitted to the Chinese Patent Office on May 18, 2012, and the application number is 201210155223. 6. The invention name is "a control method for a set top box, a set top box and a system thereof" Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of video communications, and in particular, to a method for controlling a set top box, a set top box, and a system therefor. BACKGROUND OF THE INVENTION As a device for connecting a television device to an external signal source, a set top box can convert a compressed digital signal or analog signal into video content and display it on a television device. Signals can come from cable, satellite antennas, broadband networks, and terrestrial broadcasts. The content received by the set-top box can receive data content, including electronic program guides, Internet web pages, subtitles, etc., in addition to the images and sounds that the analog TV can provide, so that users can watch digital TV programs on existing television devices, and can pass The network conducts interactive digital entertainment, education and commercialization activities.

However, as the demand for the number of television devices increases, the user's life entertainment needs to use multiple television devices at the same time. However, in the prior art, each set top box can only support one television device, so if the user If multiple TV devices are required, multiple set-top boxes need to be configured, which results in a large cost for the user to use the set-top box when using multiple television devices, and cannot meet the needs of the user to view multiple television devices at low cost. SUMMARY OF THE INVENTION Embodiments of the present invention provide a method for controlling a set top box, a set top box, and a system thereof, which enable a set top box to simultaneously transmit different radio frequency input signals to a plurality of television devices.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

In one aspect, a method of controlling a set top box is provided, including:

Receiving at least two RF input signals;

And respectively modulating the at least two RF input signals to a fixed frequency point; Matching output ports for each of the fixed frequency points;

Correspondingly, the matched RF input signal on the fixed frequency point is sent through the output port.

In one aspect, a set top box is provided, including:

a tuner for receiving at least two RF input signals;

a modulation decoder, configured to respectively modulate the at least two radio frequency input signals received by the tuner to a fixed frequency point;

a matcher, configured to match the output port for each of the fixed frequency points;

And a transmitter, configured to send, by using the output port, the radio frequency input signal on the fixed frequency point matched by the matcher.

In another aspect, a system is provided, comprising:

a frequency divider, configured to divide the received RF input signal into at least two RF input signals, and send the at least two RF input signals to the set top box;

a set-top box, configured to receive at least two radio frequency input signals sent by the frequency divider; respectively modulate the at least two radio frequency input signals to a fixed frequency point; and match the output port for each of the fixed frequency points; The output port corresponds to the radio frequency input signal on the fixed frequency point that is matched to be sent; the at least one television device is configured to receive, by the output port, the radio frequency on the fixed frequency point that is sent by the set top box and matched with the output port. input signal.

The set top box control method, the set top box and the system thereof are provided by the embodiment of the present invention, and the set top box receives at least two RF input signals; each of the RF input signals is respectively modulated to a fixed frequency point; and each fixed frequency point corresponds to a matching output port. ; The RF input signal on the matched fixed frequency point is sent through the output port. In this way, since the set top box will receive the plurality of radio frequency input signals and respectively modulate them to different fixed frequency points, the radio frequency input signals at the fixed frequency points are correspondingly outputted to the connected television devices on the output port, so that a set top box Different RF input signals can be transmitted to multiple TV devices at the same time, so that the purpose of controlling multiple TV devices by using one set top box can be realized, thereby satisfying the requirement of the user to watch multiple TV devices at low cost. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work. 1 is a schematic flowchart of a method for controlling a set top box according to an embodiment of the present invention;

2 is a schematic flowchart of a method for controlling a set top box according to another embodiment of the present invention;

3 is a schematic structural diagram of a set top box according to an embodiment of the present invention;

4 is a schematic structural diagram of a set top box according to another embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a system according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a system according to another embodiment of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The control method of the set top box provided by the embodiment of the present invention, as shown in FIG. 1, the method steps include: S101. The set top box receives at least two radio frequency input signals.

Exemplarily, in the home, there may be only one RF input signal, so the RF input signal can be divided into two or more RF input signals by using a frequency divider, and the set top box receives two or more RF input signals divided by the frequency divider. In order to enable a user to view a television program transmitted by each radio frequency input signal using a plurality of television devices, wherein the television device is a device capable of receiving television program information transmitted by the set top box and displaying the television program information to the user, such as a television set.

S102. The set top box respectively modulates at least two RF input signals to a fixed frequency point.

It is worth pointing out that the multiple frequency points built into the set-top box can be set when the set-top box is shipped from the factory, such as 5 fixed frequency points, which are respectively recorded as 100, 200, etc., or the user can follow the requirements from the set-top box. Among the plurality of built-in frequency points, for example, one of the frequency points denoted as 100, 179, 200, 259, 300 is selected as a fixed frequency point, for example, 100, 200, 300 are selected as fixed frequency points. .

It should be noted that since most users have only two or three TV devices connected to the set-top box, in most cases, the frequency divider inputs only two or three RF input signals, so the fixed frequency points in the set-top box can be factory-set accordingly. Five or four or four are selected by the user to ensure that the number of fixed frequency points is greater than the number of RF input signals. It is easy to think that when the number of TV devices connected to the set-top box is increased by the user, the frequency-divided input signal of the frequency divider is also increased, and the set-top box can be inside. There are more fixed frequency points to satisfy the fixed frequency point than the RF input signal, so that each RF input signal can be correspondingly modulated to the frequency point. In the embodiment of the present invention, five fixed frequency points are taken as an example, but not Five fixed frequency points are limited.

Further, the set top box corresponds to each of the received radio frequency input signals to one of the fixed frequency points, for example, the first way radio frequency input signal is corresponding to 100, and the second way is corresponding to 179, so that the user can control The television device corresponding to the fixed frequency point 100 switches the program that the user needs to watch on the first radio frequency signal. Here, by way of example only, the fixed frequency point corresponds to the radio frequency input signal mode without any limitation.

S103. The set top box corresponds to a matching output port for each fixed frequency point.

Further, the set top box may correspond to the matching output port for each fixed frequency point one by one, or may also match the output output port for each fixed frequency point at the same time.

Exemplarily, when the set top box can match the output port for each fixed frequency point one by one, it is assumed that the user needs three television devices, which are respectively placed in the master bedroom, the living room and the guest bedroom, and the set top box receives five RF input signals. The set-top box is set with five fixed frequency points, such as 100, 179, 200, 259, 300. The set-top box can modulate the first RF input signal at a fixed frequency point 100 in order of small to large, and the second RF The input signal is modulated at a fixed frequency point 179, and so on. It is worth noting that this order can also be selected by the user according to his or her preference. Here is only an example. Without limitation, the set-top box is equipped with five output ports, which are recorded as port 1, port 2, port 3. Port 4, port 5, if the user's TV device connected to the main bedroom is connected to port 1, the TV device in the living room is connected to port 2, and the TV device in the guest bedroom is connected to port 4, then the three TV devices correspond to port 1 respectively. , port 2 and port 4.

It may be assumed that the television device that the user opens the living room first matches, and the screen of the television device displays the five signal channels searched by the television device, and each signal channel corresponds to one RF input signal, for example, the first channel corresponds to The first RF input signal, and so on, the user selects the first channel, which is equivalent to selecting the first RF input signal, which is equivalent to selecting the fixed frequency point 100 matching the first RF input signal, so the user completes The matching between the fixed frequency point 100 and the port 2 enables the user to watch the program input by the first RF input signal through the television device in the living room, and can perform channel change or other operations based on the first RF input signal. Similarly, the matching output port of each fixed frequency point can be set one by one.

If the user has turned on three TV devices at the same time, then the fixed frequency matching port can be selected one by one. It is assumed that the user selects the third signal channel for the primary bedroom, that is, receives through the port 1. The third RF input signal matched by the set top box and the fixed frequency point 200, so that the user can watch the program provided by the third RF input signal through the television device of the master bedroom, such as Jiangsu Satellite TV, Beijing Satellite TV, etc. provided by the RF input signal. Multiple TV programs, etc. It should be noted that, after the user selects the signal channel for the living room, only four channels can be selected, and the third channel that has been selected by the main bedroom television device becomes gray and is not selectable. Similarly, for the guest bedroom When selected, the other two selected channels are also grayed out. Moreover, when selecting a channel for the main bedroom, the television devices in the living room and guest bedroom display the words 'waiting for configuration' to avoid multiple TV devices selecting at the same time and generating errors.

In addition, the set-top box can also match the output port for each fixed frequency point at the same time, that is, support the user to select the signal channel at the same time, as mentioned in the above example, if the first user selects the third signal channel in the master bedroom, the second user is in the living room. The third signal channel can be selected, and the set top box can transmit the third RF input signal corresponding to the third signal channel through the corresponding fixed frequency point 200 through the spreader, send it to the master bedroom through port 1, and send through port 2. To the living room, in this case, the master bedroom and the living room are based on the same RF input signal. If one TV device switches the TV program, it will cause the other TV device to perform the same exchange.

It is worth noting that the above detailed selection process is only for exemplifying the two working modes of the set top box, and is not limited thereto.

S104. The set top box sends the matched RF input signal at a fixed frequency point through the output port. In the set-top box control method provided by the embodiment of the present invention, the set-top box receives at least two radio frequency input signals; each of the radio frequency input signals is respectively modulated to a fixed frequency point; a matching output port is matched for each fixed frequency point; Match the RF input signal at a fixed frequency. In this way, since the set top box separately modulates the received multiple RF input signals to different fixed frequency points, the RF input signals at the fixed frequency points are correspondingly outputted to the connected TV devices on the output port, so that one set top box can simultaneously Transmitting different RF input signals to multiple TV devices enables the use of a set-top box to control multiple TV devices, thereby meeting the needs of users to view multiple TV devices at low cost.

A method for controlling a set top box according to another embodiment of the present invention, as shown in FIG. 2, the method steps include:

5201. The set top box receives at least two radio frequency input signals sent by the frequency divider.

5202. The set top box modulates at least two RF input signals to a fixed frequency point.

Further, the set top box modulates the received RF input signals to different fixed frequency points, that is: each RF input signal corresponds to a fixed frequency point different from the other RF input signals.

It is worth noting that the set top box can perform steps S203, S204 and after step S202.

S205, may also not perform, only use the television device and the set top box to operate, that is, skip steps S203, S204 And S205, executing S206 and S207, is not affected by steps S203, S204, and S205.

5203. The set top box receives the MAC address identification information sent by the radio remote controller.

It should be noted that since there are many manufacturers of set-top box RF remote controllers, there are many types of set-top box remote controllers. The set-top box needs to identify whether the RF remote controller used by the user matches itself, so it is necessary to pass MAC (Media Access first). Contro l, medium access control sublayer protocol), the address identification information is identified, if the received MAC address identification information belongs to the set top box preset MAC address identification information base, proceed to step S204; if the received MAC address identification information does not belong to the preset The MAC address identifies the information base, and rejects the frequency request sent by the radio remote controller.

5204. The set top box receives a frequency point request sent by the radio remote controller, and the frequency point request indicates a request of the radio frequency remote controller for a frequency of the radio frequency remote controller.

Exemplarily, the radio frequency remote controller can select a signal channel, such as a third signal channel, by using five signal channels displayed by the user on the television device, and the set top box will have a fixed frequency point corresponding to the signal channel, such as a fixed frequency point 200. Corresponding RF remote control frequency, such as the third RF remote control frequency point as the request of the RF remote control frequency point indicated by the RF remote control.

S205. The set-top box binds the frequency of the RF remote controller requested by the frequency point to the RF remote controller according to the received frequency point request, wherein the frequency of the RF remote controller and the fixed frequency point are in one-to-one correspondence.

Exemplarily, the set top box uses the third RF remote control frequency as the request of the RF remote controller and is bound thereto, so that the RF remote controller can control the matching fixed frequency point 200 through the third frequency remote control frequency point. The third RF input signal, that is, the bound RF remote control can select different programs for viewing on the third RF input signal.

S206. The set-top box corresponds to the matching output port for each fixed frequency point in a factory setting order or a user selection order.

It should be noted that, assuming that there are 5 fixed frequency points and 5 ports in the set top box, the factory setting order of the set top box may be sequentially set in the order of the first and the second, so that the user is the first television device. When port 1 is selected, port 1 is fixed to fixed frequency 100. When port 4 is selected for the second device, port 4 is fixed to fixed frequency 179. When port 5 is selected for the third device, port 5 is fixed to the third. Fixed frequency point 300; Alternatively, the user can also select a fixed frequency point corresponding to the port after selecting the port. For example, when port 1 is selected for the first television device, port 1 is fixed corresponding to the second fixed frequency point 200. When port 4 is selected for the second device, port 4 is fixed to the 4th fixed frequency point 100. When port 5 is selected for the third device, port 5 is fixed corresponding to the first fixed frequency point 179. The port has only one-to-one correspondence with fixed frequency points, and The order of matching can be performed in a certain order in the factory, or in accordance with the user's preference, and is not limited thereto.

S207. The set top box sends the matched RF input signal at a fixed frequency point through the output port. In the set-top box control method provided by the embodiment of the present invention, the set-top box receives at least two radio frequency input signals; each of the radio frequency input signals is respectively modulated to a fixed frequency point; a matching output port is matched for each fixed frequency point; Match the RF input signal at a fixed frequency. In this way, since the set top box will receive the multiple RF input signals and modulate them to different fixed frequency points respectively, the RF input signals at the fixed frequency points are correspondingly outputted to the connected TV devices on the output port, so that a set top box Different RF input signals can be transmitted to multiple TV devices at the same time, so that the purpose of controlling multiple TV devices by using one set top box can be realized, thereby satisfying the requirement of the user to watch multiple TV devices at low cost.

The set top box 30 provided by the embodiment of the present invention, as shown in FIG. 3, includes:

The tuner 301 is configured to receive at least two RF input signals.

Further, the tuner 301 can receive at least two RF input signals transmitted by the frequency divider 40. The modulation decoder 302 is configured to respectively adjust each RF input signal received by the tuner 301 to a fixed frequency point.

The modulation decoder 302 can respectively modulate each of the RF input signals to a fixed frequency set by the set-top box factory or a fixed frequency point selected by the user from the set frequency of the set-top box.

The matcher 303 is configured to modulate the decoder decoder 302 with each fixed frequency corresponding to the RF input signal corresponding to the matched output port.

Further, the matcher 303 can match the output ports for each fixed frequency point in the factory setting order one by one, or can match the output ports one by one according to the user selection order.

The transmitter 304 is configured to send, by using the output port, the RF input signal at the fixed frequency point matched by the matcher 303.

In the set-top box provided by the embodiment of the present invention, the set-top box receives at least two RF input signals; each of the RF input signals is respectively modulated to a fixed frequency point; the matched output port is matched for each fixed frequency point; and the matched output is matched by the output port. RF input signal at a fixed frequency point. In this way, since the set top box will receive the multiple RF input signals and modulate them to different fixed frequency points respectively, the RF input signals at the fixed frequency points are correspondingly outputted to the connected TV devices on the output port, so that a set top box Different RF input signals can be transmitted to multiple TV devices at the same time, enabling the use of a set-top box control The purpose of making multiple TV devices to meet the needs of users to view multiple TV devices at low cost.

Further, the set top box 30, as shown in FIG. 4, further includes:

The first receiver 305 is configured to receive a frequency point request sent by the radio frequency remote controller, where the frequency point request is a request of the radio frequency remote controller for a radio frequency remote control frequency point.

It is worth noting that before the first receiver 305 of the set top box receives the frequency point request sent by the radio frequency remote controller, the second receiver 306 receives the MAC address identification information sent by the radio frequency remote controller.

The processor 307 determines, according to the MAC address identification information, whether the first receiver 305 of the set top box receives the frequency point request of the radio frequency remote controller. That is, if the MAC address identification information received by the second receiver 306 belongs to the preset MAC address identification information base in the set top box, the first receiver 305 is caused to receive the frequency point request sent by the radio frequency remote controller; if the second receiver 306 receives The MAC address identification information does not belong to the preset MAC address identification information base, so that the second receiver 306 rejects the frequency point request sent by the radio frequency remote controller.

The radio frequency chip 308 is configured to bind the requested radio frequency remote control frequency point to the radio frequency remote control according to the frequency point request received by the first receiver 305, wherein the radio frequency remote control frequency point and the fixed frequency point are in one-to-one correspondence In this way, the RF remote controller can control the RF input signal at the matched fixed frequency point through the RF remote control frequency point, so that the RF input signal can be adjusted to watch the favorite program.

The set top box 30 can be operated by using the method provided by the foregoing embodiment, and the working method is the same as that provided by the embodiment, and details are not described herein again.

In the set-top box provided by the embodiment of the present invention, the set-top box receives at least two RF input signals; each of the RF input signals is respectively modulated to a fixed frequency point; the matched output port is matched for each fixed frequency point; and the matched output is matched by the output port. RF input signal at a fixed frequency point. In this way, since the set top box will receive the multiple RF input signals and modulate them to different fixed frequency points respectively, the RF input signals at the fixed frequency points are correspondingly outputted to the connected TV devices on the output port, so that a set top box Different RF input signals can be transmitted to multiple TV devices at the same time, so that the purpose of controlling multiple TV devices by using one set top box can be realized, thereby satisfying the requirement of the user to watch multiple TV devices at low cost.

The system in which the set top box 30 is provided in the embodiment of the present invention, as shown in FIG. 5, includes:

The frequency divider 40 is configured to divide the received RF input signal into at least two RF input signals, and send at least two RF input signals to the set top box.

The set top box 30 is configured to receive at least two radio frequency input signals sent by the frequency divider 40; respectively modulate each of the radio frequency input signals to a fixed frequency point; corresponding to each fixed frequency point, the matching output port; Match the RF input signal at a fixed frequency.

At least one television device 50, configured to receive the output and output of the set top box 30 through the output port The RF input signal at a fixed frequency matched by the port.

Further, the system in which the set top box 30 is located, as shown in FIG. 6, further includes:

At least one radio frequency remote controller 60, for accessing the sub-layer protocol MAC address identification information sent to the set top box 30, sends a frequency point request to the set top box 30, and the frequency point request is a request of the radio frequency remote controller for a radio frequency remote control frequency point.

The set top box 30, the frequency divider 40, the television device 50, and the radio frequency remote controller 60 correspond to the foregoing method embodiments. The set top box 30, the frequency divider 40, the television apparatus 50, and the radio frequency remote controller 60 can be used in the steps of the foregoing method embodiments. For the application in the specific steps, reference may be made to the above method embodiments. The specific structure of the set top box 30 is the same as that of the set top box provided in the foregoing embodiment, and details are not described herein again.

In the system provided by the embodiment of the present invention, the set top box receives at least two radio frequency input signals; each of the radio frequency input signals is respectively modulated to a fixed frequency point; the matching output port is matched for each fixed frequency point; and the matched output is matched by the output port. RF input signal at a fixed frequency point. In this way, since the set top box will receive the multiple RF input signals and modulate them to different fixed frequency points respectively, the RF input signals at the fixed frequency points are correspondingly outputted to the connected TV devices on the output port, so that a set top box Different RF input signals can be transmitted to multiple TV devices at the same time, so that the purpose of controlling multiple TV devices by using one set top box can be realized, thereby satisfying the requirement of the user to watch multiple TV devices at low cost.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the claims.

Claims

Rights request

A method for controlling a set top box, comprising:

Receiving at least two RF input signals;

And respectively modulating the at least two RF input signals to a fixed frequency point;

Matching output ports for each of the fixed frequency points;

2. The control method according to claim 1, wherein the receiving at least two radio frequency input signals comprises:

Receiving at least two RF input signals transmitted by the frequency divider.

The control method according to claim 1, wherein the fixed frequency point is a fixed frequency point set by a factory or a fixed frequency point selected by a user according to a frequency point set by a factory setting.

The control method according to claim 1, wherein the matching output port corresponding to each of the fixed frequency points comprises:

The output terminals are matched one by one for each of the fixed frequency points in the factory setting order or user selection order.

The control method according to any one of claims 1 to 4, wherein after each of the radio frequency input signals is respectively modulated to a fixed frequency point, the method further includes:

Receiving a frequency point request sent by the radio frequency remote controller, where the frequency point request is a request of the radio frequency remote controller for a frequency of a radio frequency remote controller;

Binding the radio frequency remote control frequency point to the radio frequency remote controller according to the received frequency point request, wherein the radio frequency remote control frequency point is in one-to-one correspondence with the fixed frequency point, so that The radio frequency remote controller controls the matched radio frequency input signal at the fixed frequency point through the radio frequency remote control frequency point.

The control method according to claim 5, further comprising: before binding the radio frequency remote control frequency point to the radio frequency remote controller according to the received frequency point request, further comprising: Receiving a medium access control sub-layer protocol MAC address identification information sent by the radio frequency remote controller; if the received MAC address identification information belongs to the preset MAC address identification information base, receiving a frequency point request sent by the radio frequency remote controller; If the MAC address identification information does not belong to the preset MAC address identification information database, the frequency address request sent by the radio frequency remote controller is rejected.

7. A set top box, comprising:

a tuner for receiving at least two RF input signals;

a modulation decoder, configured to respectively adjust at least two RF input signals received by the tuner Fixed to a fixed frequency point;

8. The set top box of claim 7 wherein:

The tuner is specifically configured to receive at least two radio frequency input signals sent by the frequency divider.

9. The set top box of claim 7 wherein:

The matcher is configured to match the output ports in a factory setting order or a user selection order for each of the fixed frequency points one by one.

The set top box according to any one of claims 7 to 9, further comprising: a first receiver, configured to receive a frequency point request sent by the radio frequency remote controller, wherein the frequency point request is the radio frequency remote controller a request for a radio frequency remote control frequency point;

a radio frequency chip, configured to bind the radio frequency remote control frequency point to the radio frequency remote controller according to the frequency point request received by the first receiver, where the radio frequency remote control frequency point is The fixed frequency points are in one-to-one correspondence, so that the radio frequency remote controller controls the matched radio frequency input signals on the fixed frequency point through the radio frequency remote control frequency point.

The set top box according to claim 10, further comprising:

a second receiver, configured to receive media access control sublayer protocol MAC address identification information sent by the radio frequency remote controller;

a processor, configured to: if the MAC address identification information received by the second receiver belongs to a preset MAC address identification information base, enable the first receiver to receive a frequency point request sent by the radio frequency remote controller; The MAC address identification information received by the second receiver does not belong to the preset MAC address identification information database, so that the first receiver refuses to receive the frequency point request sent by the radio frequency remote controller.

12. A system, comprising:

13. The system according to claim 12, further comprising: At least one radio frequency remote controller, configured to send media request control sub-layer protocol MAC address identification information to the set top box, to send a frequency point request to the set top box, where the frequency point request is a request of the radio frequency remote controller for a radio frequency remote control frequency point .